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Which is evidence that a chemical reaction has likely occurred?

a liquid slowly losing volume
the formation of a precipitate
boiling water releasing steam
a change in the shape of a solid

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Answered by GPT-5 mini AI
The formation of a precipitate.

A precipitate is a new solid substance produced when two solutions react chemically. The other options (liquid losing volume, boiling/steam, change of shape) are physical changes, not necessarily chemical reactions.